Access Google spreadsheet API without Oauth token

Question

I've read google spreadsheet documentation https://developers.google.com/sheets/api/guides/authorizing And it says, that if document is public, you don't need Oauth 2.0 and API key is sufficient. I'm trying to do a test request with hurl and api key as parameter.it, but it still gives me error, that I need to use Oauth, any thoughts?

POST https://sheets.googleapis.com/v4/spreadsheets/16woR-nfy6KYBbkQpC2YOT1GzIean8rTzjueUnlzLMiE/values/Sheet1!A1:E1:append?valueInputOption=USER_ENTERED

Response: "error": {"code": 401,"message": "Request is missing required authentication credential. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project.","status": "UNAUTHENTICATED"}

Answer 1

API key is not enough. You're trying to use spreadsheets.values.append which requires OAuth authorization:

Authorization Requires one of the following OAuth scopes:

https://www.googleapis.com/auth/drive
https://www.googleapis.com/auth/drive.file
https://www.googleapis.com/auth/spreadsheets
For more information, see the [Auth Guide](https://developers.google.com/identity/protocols/OAuth2).

Note it says OAuth.